010-elasticsearch5.4.3【四】-聚合操作【一】-度量聚合【metrics】-min、max、sum、avg、count

一、概述

　　度量类型聚合主要针对的number类型的数据，需要ES做比较多的计算工作

参考向导：地址

import org.elasticsearch.search.aggregations.AggregationBuilders;

SearchResponse sr = node.client().prepareSearch()
        .setQuery( /* your query */ )
        .addAggregation( /* add an aggregation */ )
        .execute().actionGet();

1.1、构建聚合

可以在聚合内定义子聚合。 聚合可以是度量聚合或桶聚合。

例如，这是一个由以下各项组成的3级聚合： term聚合（桶） 日期直方图聚合（桶） 平均聚合（度量）

SearchResponse sr = node.client().prepareSearch()
    .addAggregation(
        AggregationBuilders.terms("by_country").field("country")
        .subAggregation(AggregationBuilders.dateHistogram("by_year")
            .field("dateOfBirth")
            .dateHistogramInterval(DateHistogramInterval.YEAR)
            .subAggregation(AggregationBuilders.avg("avg_children").field("children"))
        )
    )
    .execute().actionGet();

1.2、度量聚合【metrics】

更多API

1）基本聚合：min max sum avg操作，一般作用于number类型字段上

        // 这里可以修改成 min max  sum avg
        MinAggregationBuilder aggregation =
                AggregationBuilders
                        .min("号码")
                        .field("num");

        SearchResponse sr = client.prepareSearch()
                .addAggregation(aggregation
                )
                .execute().actionGet();
        Min aaa = sr.getAggregations().get("号码");
        double value = aaa.getValue();
        System.out.println("号码:"+value);

2）综合聚合

StatsAggregationBuilder aggregation =
        AggregationBuilders
                .stats("agg")
                .field("height");

使用

// sr is here your SearchResponse object
Stats agg = sr.getAggregations().get("agg");
double min = agg.getMin();
double max = agg.getMax();
double avg = agg.getAvg();
double sum = agg.getSum();
long count = agg.getCount();

3）扩展综合聚合

ExtendedStatsAggregationBuilder aggregation =
        AggregationBuilders
                .extendedStats("agg")
                .field("height");

使用

// sr is here your SearchResponse object
ExtendedStats agg = sr.getAggregations().get("agg");
double min = agg.getMin();
double max = agg.getMax();
double avg = agg.getAvg();
double sum = agg.getSum();
long count = agg.getCount();
double stdDeviation = agg.getStdDeviation();
double sumOfSquares = agg.getSumOfSquares();
double variance = agg.getVariance();

4）count聚合

ValueCountAggregationBuilder aggregation =
        AggregationBuilders
                .count("agg")
                .field("height");

使用

// sr is here your SearchResponse object
ValueCount agg = sr.getAggregations().get("agg");
long value = agg.getValue();

5）百分比聚合

PercentilesAggregationBuilder aggregation =
        AggregationBuilders
                .percentiles("agg")
                .field("height");

默认会提供百分比区间。也可以自定义

PercentilesAggregationBuilder aggregation =
        AggregationBuilders
                .percentiles("agg")
                .field("height")
                .percentiles(1.0, 5.0, 10.0, 20.0, 30.0, 75.0, 95.0, 99.0);

使用

import org.elasticsearch.search.aggregations.metrics.percentiles.Percentile;
import org.elasticsearch.search.aggregations.metrics.percentiles.Percentiles;
// sr is here your SearchResponse object
Percentiles agg = sr.getAggregations().get("agg");
// For each entry
for (Percentile entry : agg) {
    double percent = entry.getPercent();    // Percent
    double value = entry.getValue();        // Value

    logger.info("percent [{}], value [{}]", percent, value);
}

结果展示

percent [1.0], value [0.814338896154595]
percent [5.0], value [0.8761912455821302]
percent [25.0], value [1.173346540141847]
percent [50.0], value [1.5432023318692198]
percent [75.0], value [1.923915462033674]
percent [95.0], value [2.2273644908535335]
percent [99.0], value [2.284989339108279]

6）百分比行列

示例

PercentileRanksAggregationBuilder aggregation =
        AggregationBuilders
                .percentileRanks("agg")
                .field("height")
                .values(1.24, 1.91, 2.22);

使用

import org.elasticsearch.search.aggregations.metrics.percentiles.Percentile;
import org.elasticsearch.search.aggregations.metrics.percentiles.PercentileRanks;
// sr is here your SearchResponse object
PercentileRanks agg = sr.getAggregations().get("agg");
// For each entry
for (Percentile entry : agg) {
    double percent = entry.getPercent();    // Percent
    double value = entry.getValue();        // Value

    logger.info("percent [{}], value [{}]", percent, value);
}

结果

percent [29.664353095090945], value [1.24]
percent [73.9335313461868], value [1.91]
percent [94.40095147327283], value [2.22]

7）基数聚合

CardinalityAggregationBuilder aggregation =
        AggregationBuilders
                .cardinality("agg")
                .field("tags");

使用

import org.elasticsearch.search.aggregations.metrics.cardinality.Cardinality;
// sr is here your SearchResponse object
Cardinality agg = sr.getAggregations().get("agg");
long value = agg.getValue();

更多操作：地址